those who were able to complete their tour of S.D. (72 hr.), and those who demanded an early release. (The chamber was provided with a panic button by which S could signal for release.) A t test showed that Ss (Group I) who panicked utilized the viewer significantly more (P < .01) than did those (Group 11) who completed the confinement. Group I1 operated the viewer more during the second and third day of S.D. but scill accumulated less viewing time than did Group I which was confined only about half as long. REFERENCE
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Vernon et al. (1960) studied this question.